diff --git a/lib/dns/include/dns/rdatalist.h b/lib/dns/include/dns/rdatalist.h
index ef746cb976..148a23e6ff 100644
--- a/lib/dns/include/dns/rdatalist.h
+++ b/lib/dns/include/dns/rdatalist.h
@@ -56,6 +56,7 @@ ISC_LANG_BEGINDECLS
 struct dns_rdatalist {
 	dns_rdataclass_t		rdclass;
 	dns_rdatatype_t			type;
+	dns_rdatatype_t			covers;
 	dns_ttl_t			ttl;
 	ISC_LIST(dns_rdata_t)		rdata;
 	ISC_LINK(dns_rdatalist_t)	link;
diff --git a/lib/dns/include/dns/rdataset.h b/lib/dns/include/dns/rdataset.h
index aa0d0a47b2..e7923e6cbc 100644
--- a/lib/dns/include/dns/rdataset.h
+++ b/lib/dns/include/dns/rdataset.h
@@ -53,6 +53,7 @@
 #include <isc/boolean.h>
 #include <isc/buffer.h>
 #include <isc/lang.h>
+#include <isc/stdtime.h>
 
 #include <dns/types.h>
 #include <dns/result.h>
@@ -93,6 +94,7 @@ struct dns_rdataset {
 	dns_rdatatype_t			type;
 	dns_ttl_t			ttl;
 	dns_trust_t			trust;
+	dns_rdatatype_t			covers;
 	/*
 	 * attributes
 	 */